Up Down Volume Ratio: What Volume Reveals About Stock Strength
The Up Down Volume Ratio (UDVR) is a TradingView momentum indicator that compares total trading volume on up days against total volume on down days over a specific lookback period. A ratio above 1.0 means more volume flowed on green days; below 1.0 means sellers drove the heavier sessions. If you swing trade or follow CANSLIM-type setups, this gauge helps spot where institutional money is building positions versus quietly exiting them.
What Is the Up Down Volume Ratio?
UDVR works on a simple premise. Days a stock closes higher accumulate buying pressure. Days it closes lower reflect selling pressure. The ratio divides total up-day volume by total down-day volume over the lookback window, typically 50 periods.
The formula:
UDVR = Σ(Volume on Up Days) / Σ(Volume on Down Days)
Where an "up day" means close > previous close, and a "down day" means close < previous close.
Example with real numbers: On NVDA in early October 2025, the 10-day up volume came in at roughly 4.2 billion shares traded against 2.8 billion on down days. That gives:
4,200,000,000 / 2,800,000,000 = 1.50
A ratio of 1.5 means buyers accounted for 50% more volume than sellers over that window. I've been watching NVDA's UDVR since late September, and when it stayed above 1.3 for five consecutive days while the stock held above its 50-day moving average, that's when I added to my position. The run from $124 to $147 in October validated what the ratio was signaling.
Lookback Period Settings
| Timeframe | Typical Setting | Best For |
|---|---|---|
| Short-term (days to weeks) | 10-20 periods | Momentum traders catching quick moves |
| Medium-term (weeks to months) | 30-50 periods | Swing and position traders |
| Long-term (months+) | 50-100 periods | Investors tracking macro accumulation |
I prefer a 30-period lookback on volatile names like MSTR. It catches shifts faster than the default 50. I haven't tested it on slower dividend stocks, so I can't say the same patterns hold there.
Setting Up UDVR on TradingView
Click the "Indicators" button at the top of your TradingView chart and search "Up Down Volume Ratio" or "Up/Down Vol Ratio." A handful of community versions pop up. Most calculate over a 50-period window by default.
| Factor | What to Look For |
|---|---|
| Lookback Period | Standard is 50. Short-term traders often drop to 20 or 30. |
| Display Format | Some versions show a raw ratio line. Others overlay a moving average or color-code the slope. |
| Alert Support | Big one if you aren't glued to the screen. Pick a version that lets you trigger alerts when the ratio crosses key levels. |
Try two or three versions and see which visual style clicks with you. The developer names differ but they track the same core metric.
If you want more control over volume indicators without hunting for community scripts, tools like Pineify let you build custom UDVR versions with your own lookback, display, and alert logic. No coding required — you pick the parameters and the indicator adjusts to your strategy, not the other way around.
Reading the Numbers
A ratio above 1.0 is a baseline bullish signal — more volume on up days than down. Between 1.25 and 1.5 is the sweet spot most swing traders look for: sustained institutional buying without speculative frenzy. Above 2.0 signals heavy accumulation from big players. I've seen this on growth stocks like PLTR right as they entered major uptrends.
Below 1.0 flips the story. Sellers are driving volume, which creates downward pressure. At exactly 1.0, buyers and sellers are in a stalemate — the market is indecisive.
The trend of the ratio matters as much as the number itself. A ratio climbing from 1.2 to 2.5 shows buying pressure accelerating. That momentum is actionable. A ratio falling from 2.5 to 1.2 while staying technically above 1.0? That's a warning that selling volume is creeping in, even though the headline number still looks bullish.
On TSLA I watched the ratio drop from 2.1 to 0.8 over six weeks in mid-2025. The price was still holding around $260, so the divergence was easy to miss if you only looked at the chart. I trimmed my position based on that signal. Two weeks later the stock dropped 15%.
| If you see... | That means... |
|---|---|
| Ratio above 1.5 and rising | Strong accumulation, trend likely continues |
| Ratio above 1.0 but declining | Buying pressure fading, caution warranted |
| Ratio below 1.0 and falling | Distribution in play, avoid or short |
| Ratio rising while price falls | Potential reversal brewing (accumulation during weakness) |
Trading Strategies with UDVR
Trend Confirmation
Before entering a long trade, check that UDVR sits above 1.0 — ideally above 1.5. That confirms the price move has volume backing, not just noise. For short setups, a ratio below 1.0 confirms sellers are in control.
Breakout Validation
This is where UDVR earns its keep. A stock breaking a resistance level with UDVR above 1.0 has institutional support. The higher the ratio, the more likely the breakout holds. I watched MSTR break above $180 in August 2025 with a UDVR of 1.8 — the move held and ran another 22% over the next three weeks. Without that volume confirmation, I would have been skeptical.
Divergence Detection
Price hitting new highs while UDVR trends lower is a red flag. It means the buying power behind the rally is fading — often smart money distributing into strength. The opposite scenario — price still falling but UDVR improving — hints at accumulation during weakness. Combine UDVR divergence with other tools like the On-Balance Volume trading strategy for a fuller picture.
Stock Scanning
Set a minimum UDVR filter of 1.25 when scanning for long candidates. For high-growth names, many experienced traders won't look below 2.0. It separates stocks with genuine institutional interest from ones that are just volatile. A solid overview of the broader toolkit is in the volume indicators guide.
| Strategy | Bullish Signal | Bearish Signal |
|---|---|---|
| Trend Confirmation | Ratio > 1.0 (ideally > 1.5) | Ratio < 1.0 |
| Breakout Validation | Ratio > 1.0 at breakout | Price breaks out but ratio < 1.0 |
| Divergence Detection | Price down, ratio improving | Price up, ratio declining |
Combining UDVR with Other Tools
UDVR works best alongside complementary indicators.
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Moving averages: A stock above its 50-day MA with UDVR above 1.5 is a far more reliable setup than either signal alone. Confirms both trend direction and volume conviction.
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Relative strength: Find stocks outperforming their sector AND carrying strong UDVR readings. Double confirmation that the rotation is real.
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OBV and Accumulation/Distribution: UDVR compares up vs down volume over a fixed window. OBV adds volume cumulatively and never resets. The Accumulation/Distribution line weights volume by where the close falls within the day's range. Each tells you something slightly different about money flow. When all three agree, that's as close to a conviction read as you get. The Anchored VWAP indicator adds another layer for entry timing based on volume-weighted price levels.
| Combine UDVR with... | What it tells you |
|---|---|
| Moving Averages | Whether the trend direction has volume support |
| Relative Strength | Which stocks have both momentum and institutional backing |
| OBV / A/D Line | A cross-check on accumulation or distribution stories |
Common Mistakes
Watching the level, ignoring the slope. A ratio of 1.8 looks fine until you notice it dropped from 3.0. The declining slope means buying momentum is fading even though the number is still above 1.0.
Applying it to new stocks. UDVR needs enough data to be reliable. Avoid using it on stocks with less than 50 periods of trading history. An IPO that's two weeks old won't give you meaningful reads.
Reading it in a market vacuum. A stock's ratio only makes sense against broader market volume patterns. If the entire market saw a volume surge, a high ratio on one stock might just be noise.
Chasing extremes. A ratio above 3.0 can signal a buying frenzy that precedes a short-term pullback. It is not always a buying opportunity. Sometimes it means the crowd is late to the party.
| Trading style | Suggested UDVR threshold |
|---|---|
| Conservative, steady moves | 1.25 |
| Aggressive, growth stocks | 2.0 |
A useful exercise: go back through your old trades and see how they would have looked with a UDVR filter applied. I've done this on my own journal and found that roughly 60% of my losing entries had a UDVR below 1.0 at the time of entry — I was buying into distribution without realizing it.
What UDVR level will you test first in your own scans?
Frequently Asked Questions
▶What is the Up Down Volume Ratio (UDVR) in TradingView?
The Up Down Volume Ratio is a momentum indicator that divides total volume on up days by total volume on down days over a set lookback period, usually 50 days. A ratio above 1.0 signals buyers are more active than sellers. Below 1.0 points to selling pressure. It is one of the cleaner ways to gauge whether institutional money is flowing into or out of a stock.
▶How do I add the Up Down Volume Ratio to my TradingView chart?
Click the "Indicators" button at the top of your chart and search for "Up Down Volume Ratio" or "Up/Down Vol Ratio." Several community-built versions will appear. Pick one that offers your preferred lookback period, display format, and alert support. Try a couple to see which layout feels natural to you.
▶What UDVR value should I look for when buying stocks?
Most swing traders target at least 1.25 to 1.50 as a baseline. Growth stock traders often require above 2.0, which signals strong institutional buying. The 1.25 to 1.50 range tends to be the sweet spot — healthy accumulation without the overheating that often precedes a pullback.
▶How does the Up Down Volume Ratio differ from On-Balance Volume (OBV)?
UDVR compares up-day volume against down-day volume over a fixed window, producing a ratio that resets with each new period. OBV is cumulative — it adds volume on up days and subtracts on down days, and never resets. UDVR gives a snapshot of recent balance. OBV tracks the long-term money flow direction.
▶How does UDVR differ from the Accumulation/Distribution Line?
The A/D Line weights volume by where the close falls within the day's high-low range, not just whether the day was up or down. It is also cumulative rather than a fixed-window ratio. UDVR is simpler to read day-to-day, but the A/D Line captures more nuance about intraday buying and selling pressure.
▶How often should I check the Up Down Volume Ratio?
It depends on your holding period. Swing and position traders holding for weeks or months can check it weekly or when screening new candidates. Day traders may look at it daily, though the 50-period default makes it naturally better suited for spotting medium-term trends than intraday shifts.
▶Can the Up Down Volume Ratio be used for crypto or ETF trading?
Yes, it works for cryptocurrencies and ETFs because they have transparent, centralized volume data. It is not reliable for spot forex — volume is fragmented across decentralized brokers with no standard. Consider forex futures instead, which report official volume figures.
▶What are the best settings for the Up Down Volume Ratio lookback period?
The default 50-period window fits swing and position traders. For shorter-term momentum moves, try 20 or 30 periods — it makes the indicator more responsive. Avoid going under 15 periods; the ratio gets noisy. Match the lookback to how long you typically hold a position.
▶What does a declining Up Down Volume Ratio mean even when price is rising?
This is a bearish divergence. The price is climbing but the volume supporting those up days is shrinking relative to down-day volume. It often means institutional money is quietly selling into the rally. I have seen this pattern precede trend reversals in multiple positions — it is one of the most useful warnings UDVR can give you.